Toe walks are a great exercise to do before you run to wake up and activate all the small muscles in your foot. This drill will strengthen the calf muscles and stretch the frequently shortened toe extensors.
Begin by standing tall with your feet about hip width apart, up on the balls of your feet and lifting your heels off of the ground. Walk forward, taking small steps on the balls of your feet and balancing on your toes.
Keep your knees straight but not fully locked whilst walking in as straight a line as possible.